Linux Disk space

Naranthiran D
Naranthiran D used Ask the Experts™
Need a script to Monitor disk space alert in Linux servers.

I need to run the script for one server and collect the results(HTML Out Put with colour ) of all the server and created a consolidated report with the below columns

Server IP Volume name volume %
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nociSoftware Engineer
Distinguished Expert 2018

you can parse the output of df and convert it to html.
Shiju JacobInfo Security Manager

below is a script which mail if crosses 90 %

df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
  echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge 90]; then
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |
     mail -s "Alert: Almost out of disk space $usep%"
Distinguished Expert 2017

Are the systems in the same location, you can configure SNMP, snmptrapd with notifications.
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From the following website:

CURRENT=$(df / | grep / | awk '{ print $5}' | sed 's/%//g')

if [ "$CURRENT" -gt "$THRESHOLD" ] ; then
    mail -s 'Disk Space Alert' << EOF
Your root partition remaining free space is critically low. Used: $CURRENT%

To run it daily, for example, save the script to the file in your home directory, change the email to your email, and add the following line at the end of /etc/crontab file:

@daily ~/

I think this is basically what Shiju Jacob has said with a suttle difference

Have you thought about using webmin? Free software that can give you all information you need about all your servers on your network
DevOps Engineer
Distinguished Expert 2018
First create a awk script with following contents,

vi script.awk

    print "<html><body><table  border=\"8\" cellpadding=\"3\"  style=\"border-collapse: collapse\">"

    print "<tr>"
    print "<th bgcolor=turquoise colspan="6">BEFORE_USAGE</th>"
    print "</tr>"
    print "<tr>"
    print "<th bgcolor=gray>MOUNT</th>"
    print "<th bgcolor=gray>SIZE</th>"
    print "<th bgcolor=gray>USED</th>"
    print "<th bgcolor=gray>AVAILABLE</th>"
    print "<th bgcolor=gray>USE%</th>"
    print "</tr>"

NR > 1 {
    if ($5+0 > 70) {
        bgcolor=" bgcolor=azure"
    print "<tr><td>"$6"</td><td>"$2"</td><td>"$3"</td><td>"$4"</td><td"bgcolor">"$5"</td></tr>"

    print "</table></body></html>"

Then use the command to extract the output to html file,

df -Ph | awk -f aa.awk > disk_usage.html

here is the sample output.

and you can attach this file with email .
Naranthiran DSystem Administrator


Thanks Prabhin ;)

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